Reflector for focusing cathode-rays



(No Model.)

R.4 M. RUSSELL. RBFLEGTOR FOR FOGUSING GATHODB RAYS.

No. 579,808.` Patented Mar. 30, 1897.y

It i f" @v1/hmmm Q UNITED STATES PATENT Gerlos.

RALPH MORGAN RUssELL,- or BIRMINGHAM, ALABAMA.

REFLEGTOR FOR FOCUSiNG CATHODE-RAYS.

SPECIFICATION forming` part of Letters Patent No. 579,808, dated March 30, 1897. Application led September 15, 189'6. Serial No. 605,927. (No model.)

hereby declare that the following is a full,

clear, and exact description of theinvention, which will enable others skilled in the art to which it appertains to make and use the same,

reference being had to the accompanying drawings, which form a cation.

My invention relates to an improved reflector for focusing the X or cathode rays part of this specififrom a Grookes tube directly onto a focal body,

whereby the image may be projected upon a iluoroscopic screen.

-As is now known, the cathode-rays of a Crookes tube cannot penetrate a dense substance, such as leador platinum, andadvantage is taken of such fact by locating the tube in a lead-lined box with a front opening, so that the X-rays, instead of being absorbed by the lead, will be reflected onto the focal object in front of a iiuoroscopic screen.

I have found by vexperiment that lead alone will not perfectly reflect the X` or cathode rays,for while it possesses sufficient density it should also have a certain degree of springiness or resiliency to cause perfect reflex action, so that the rays will more thoroughly penetrate the focal object.

I have found by experiment that by making the reflector `of a dense material, such as lead, zinc, platinum, or nickel, concavo convex in form, and lining it with 'a dense springy or resilient substance, such as tin,

steel, or iron, the. X-rays fr om a Crookes tube located in the reiiector are more properly focused on a focal object than when lead or platinum is used alone. p I have also found that by lining the focuser or reflector with a pile fabric of a dark coloi,sucht'as purple,

, dark blue, or black velvet, the power of `chie focuser will be increased, as the velvet: will absorb other rays in its field, .whichwould interfere with the X-rays and cause the shadows to be deeper or more pronounced on the fluoroscopic screen.

The invention consists 1n the novel construction and combination of parts hereinafter fully described and claimed.

In the accompanying drawings, Figure lis a side elevation of a focuser or reflector constructed in accordance with my invention.' Fig. 2 is a central longitudinal section. Fig.

,3 is a front view.

In the said drawings the reference-numeral 1 designates the reflector, made of a concavoconvex shell of lead or other similar material, or in the form of a concave semisphere. This lead on its inner side isprovided with a shell or a lining 2, of tin or other similar material, which in turn is covered with apile fabric 3, such as dark velvet. The numeral 4 designates the Crookes tube. At opposite sides of the reector are pins 5, to which are pivoted legs' or supports 6, h eld in place thereon by screw-knobs 7. These pins form pivots which turn in the legs vto allow the reector to ignates a counterba'lance-weight.

The'operation will be readily understood from the foregoing.

Havingthus fully described my invention 1. As an improved article a focuser for X or cathode rays, consisting of the outer concavo-convex shell `of lead or other inelastic metal, and an inner shell or lining of tin` or other elastic metal,substantially as described.

2. The'combination with the 'focuser consisting of the concavo-convex'leaden shell, the inner shell of tin, and the velvet lining, of the'Orookes tube located in the concavity be adjusted. The numeral 8 des-y of the focuser or reflector; substantially as described.

In testimony that I claim the foregoing'as my own I vhave hereunto affixed my signature in presence of'two witnesses. RALPH MORGAN RUSSELL.

-Witnesses:

R. H. TEACH, T. B. S'roUGn. 

